In a study published Wednesday in the British Journal of Sports Medicine, an international research team examined data on how more than one million children between the ages of nine and 17 from 50 countries performed on the shuttle run test

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Dave McGinn writes about fitness trends for the Life section and also reports for Globe Arts. Prior to joining the Globe, he was a freelance journalist, covering topics from trying to eat Michael Phelps' diet to why the Joker is the best villain in comics history. He's working on improving his 10k time.